I would not say that is a reason why all configuration managers suck. The feature you'd like to see would represent a significant increase in overhead, complex

I would not say that is a reason why all configuration managers suck. The feature you'd like to see would represent a significant increase in overhead, complexity, and potential drawbacks that not everyone needs yet. Meanwhile, a disciplined system of designing and documenting tests and rollback procedures before committing changes will accomplish this without the need for additional software. My guess is that if you are not disciplined enough to design tests and rollback procedures on your own, then you are probably going to just switch off or work around those features if they are built into the software.